Fruit Development and Endogenous Hormone Concentrations in Mango Fruit with Aborted and Non-Aborted Embryos

摘要

Changes in fruit development and endogenous hormone concentration were compared between fruit with aborted embryos and those with normal embryos in 'Tainong-1' (TN-1) and 'Jinhuang' (JH) mango varieties. Changes in fruit volume over time followed a "S" pattern from 10 to 60 days after fruit set (DAS). The appearance of embryo in aborted fruit differed from that of non-embryo aborted fruit from 10 to 30 DAS suggesting that 20-30 DAS was a key period in embryo abortion. After 30 DAS, fruit with normalembryos increased in size very rapidly in contrast to fruit with aborted embryos which grew much slower. In normal fruit and those with aborted embryos, concentrations of GA3, IAA, ZT and ABA in pulp were highest 10 DAS, then gradually declined. From 10-30 DAS, pulp of fruit with aborted embryos had lower IAA, GA3 and higher ABA concentrations than fruit normal embryos as well as higher ratios of ABA/ZT and ABA/(GA_3 + IAA + ZT). The IAA/GA_3 ratio was positively related to fruit volume.